The SP-850 (S4228-1) Spectrophotometer has a continuous spectral range of 330-999 nm accommodates many photometric analyses performed in clinical and industrial laboratories. This spectrophotometer uses a plane diffraction grating monochromator. The large versatile sample fits both round (12-13 mm diameter) and standard square cuvettes. Possible applications include phosphorus analysis, iron analysis, chlorophyll analysis, turbidity as well as color and clarity testing. Analog output to interface the instrument to a data processor, strip chart recorder, or other external analog device. Serial RS-232C and/or parallel centronics printer port for interfacing spectrophotometer with a computer or external printer. User-friendly software allows even inexperienced personnel to operate the unit without touching a manual. Fan cooling ensures temperature stability. 8 nm spectral bandwidth. Easy-to-read wavelength selector is graduated in 1nm increments. Auto-zero function pushbutton setting of 100% TRANS and 0.000 ABS at one touch. Five switchable built-in second-order stray light filters eliminate the inconvenience of exchanging filters. Concentration mode that allows the concentration of a solution to be read directly from the unit, and conforms to GLP. An expanded 4.5 digit LED allows high concentration and factor values to be displayed. Decimal key permits a choice for decimal placement. Factor mode permits you compensation for day-to-day variations in quantitative analyses. Large, versatile keypad. The SP-870 (S4228-2) Has all the features of the SP-850 (S4228-1) plus 5 nm spectral bandwidth for even higher resolution, 20 X 2 LCD display, automatic stray light filter selection, and digital wavelength selection with LCD readout. Specifications: Bandwidth: S4228T-1: 8 nm / S4228T-2: 5 nm, Wavelength Range: 330 to 999 nm, Wavelength Accuracy: ±2nm, Wavelength Repeatability: ±0.5 nm, Photometric Accuracy: 1% at 1A, Grating: 600 lines/mm, Shipping Weight: 20 Lbs.